The tuner system of ADS 25 MeV Linac(Fig.1)built in CM1,CM2 and CM3 consists of 17 tuners and every tuner consists of two parts-linear drive unit and tuning implement unit.Linear drive unit is mainly composed of step motor,reduction box,screw-nut and coupler(Fig.2).To learn about the working conditions and structure characteristics,17 tuners were tested and the CM1-2,CM2-3 and CM3-1 were chosen as representatives to give a brief introduction of test procedure and results.
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